RMS Journaling for OpenVMS

This Software Product Description (SPD) covers RMS Journaling for OpenVMS (Version 6.2), designed for both VAX and Alpha architectures. It details three primary journaling methods: after-image (AI) for redoing modifications, before-image (BI) for undoing modifications, and recovery unit (RU) journaling to ensure atomic transaction integrity. The document explains how journaling is enabled on a file-by-file basis, hardware and software requirements, integration with the DECdtm transaction services, interaction with backup utilities, and recovery procedures for different failure scenarios.